crust

noun
A more solid, dense or hard layer on a surface or boundary.The external, hardened layer of certain foodstuffs, including most types of bread, fried meat, etc.An outer layer composed of pastryThe bread-like base of a pizza.The outermost layer of the lithosphere of the Earth.The shell of crabs, lobsters, etc.Nerve, gall.A living.

verb
To cover with a crust.To form a crust.

noun
A subgenre of punk rock, derived from hardcore punk with extreme metal elements, often with pessimistic lyrics about political and social ills.